Genentech is buying Seragon Pharmaceuticals Inc. for $725 million in cash, adding a treatment for breast cancer.

Seragon, headquartered in San Diego, is a biotechnology development company that is in Phase I trials for a product called ARN-810, which is being evaluated to treat metastic breast cancer. The group is also working on therapies for endometrial and ovarian cancers. The deal could be valued at up to $1.75 billion, including $1 billion of contingent development milestone payments.

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